Patent US3384439A successfully refreshed from Google Patents.
US3384439A
Expired / Lapsed
US
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Pulsed spark gas ignition and flame monitoring system
Assignee: Fenwal Inc
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Filing: 1966-04-05
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Granted: 1968-05-21
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Expires: 1986-04-05
Abstract
No abstract record available.
Inventors
- 👤 Lyman H Walbridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:04
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/20; F23N5/203; F23N5/02; F23N5/12; F23N5/123; F23N5/14; F23N5/143; F23Q; F23Q3/00; F23Q3/004; F23N2227/00; F23N2227/04; F23N2227/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3045148A
Cited
US3277949A
Cited
US3338288A
Cited
US3306339A
Cited
US3291183A
Cited
US3318358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |